Gray counter
From LifeWiki
Gray counter  
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Pattern type  Oscillator  

Oscillator type  Muttering moat  
Billiard table  
Number of cells  26  
Bounding box  13×9  
Period  4  
Mod  4  
Heat  2  
Volatility  0.13  
Strict volatility  0.13  
Discovered by  Unknown  
Year of discovery  1971  
 
 
 

Gray counter is a period 4 oscillator that was found in 1971. The interior rotor simulates a cycle through the Gray codes from 0 to 3.
The 5cell long sides of the main part of the stator require induction coils: the option with the smallest population (as well as the highest symmetry) uses two tubs as pictured. A smaller bounding box may be reached using snakes or biblocks.
A 27glider synthesis is known for a stator variant of this oscillator in which one of the tubs is replaced with a boat.^{[1]}
See also
References
 ↑ Adam P. Goucher. "xp4_wgiligz25a888a52zx256". Catagolue. Retrieved on May 24, 2019.
External links
 Gray code at Wikipedia
 Gray counter at the Life Lexicon
 26P4.3 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
 Patterns
 Oscillators with 26 cells
 Patterns with 26 cells
 Patterns found in 1971
 Patterns that can be constructed with 29 gliders
 Oscillators
 Periodic objects with minimum population 26
 Muttering moats
 Billiard tables
 Oscillators with period 4
 Oscillators with mod 4
 Oscillators with heat 2
 Oscillators with volatility 0.13
 Oscillators with strict volatility 0.13
 Patterns with rectangular orthogonal symmetry
 Seminatural periodic objects